Hey guys, Hope there is a guru who can figure this out for me, its a 94 ford ranger, 4.0L...my headlights flash after about 20 min of being on. When I disconnect the right bulb, the flashing stops, the left one stays on continuously. I had a previous problem of the right bulb going out, I replaced the headlight assembly, stopped the bulb going out, was fine for about 2 weeks, then this flashing problem started up. I figured it was in the plug, so I replaced it, still flashing after 20 min of driving. Any ideas of what might be causing this? Thanks, Adam

Never hear that, it flashes on both sides, kind of like I'm in a rush to get somewhere, people pull over sometimes. Don't hear any clicking or see the arrow come up on the dash, its strange. Thanks for the help. - A

Has it been in a accident i.e. hit in the front and repaired? Flashing on and off, or between high and low beam? Sounds like a lose ground to me. The reason both lights flash is that the headlights are wired together usually the left light has splices that go over to the right light. Try running a temporary ground wire to the light ckt just a jumper wire will do usually the wire is black. and see if it stops flashing. Also could have a lose connection @ the switch or maybe a bad switch. There isn't too many things that will cause that problem. Also the dimmer in the column can be bad Fords have alot of problems out of the multifunction switch on the column. hope this helps ...Ed

My Mustang has this same problem 5 seconds after I put high beams on it starts flashing. Once in a while even low beams act up.
I think Ford has put a circuit breaker into the light switch they get old and over sensitive like old people.

Another thing that can cause "A" ("single" ) headlight to go on and off at will...is the filament is burned out ever so slightly...and vibrating against the rest of the filament structure causing the light to go on and off...(Ever smack one with your hand to get it to work for awhile? ) BUT that shouldn't effect BOTH headlights..just the one with the burned out filament.

Its never been in an accident, i'm the third owner so I don't know for sure, but if it was, they did a REAL good job. They don't flash hi-beam to low-beam, the lights dim on and off. The weird thing is that when I disconnect the right one, the left light stays on steady. I'll give the ground wire a shot first. Thanks, Adam

It does sound more like a breaker just because it takes some time for it to happen. It could be ground and that was my first thought but again the time thing is what leads me to think breaker. Do they dim or go out all togther? Could also be in the switch, if it is worne it could be getting hot causing a gap or break in the circuit.

Put a volt meter on the line near the light and make sure it is dropping volts, then find the power wire on the switch and see if it is dropping there as well. Then check the power wire going into the switch and see if it's dropping there.

sounds like a ground! I bet a dollar against a dough nut you have bad ground or grounds. Lights are dim because there trying to ground threw the filaments and what you think is low power is power trying to get to ground. and the resistance in the filaments heat up = dim light. See it all the time at the shop.

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